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Properties of Air at 1 atm Pressure

Heat Transfer Engineering
Thermodynamics
Engineering Physics

Properties of air at 1 atm pressure

Temp T, °C	Density ρ, kg/m3	Specific Heat cρ	Thermal Conductivity k, W/m•K	Thermal Diffusivity α, W/m•K	Dynamic Viscosity µ, kg/m•s	Kinematic Viscosity ν, m2/s	Prandtl Number Pr
-150	2.866	983	0.01171	4.158 x 106	8.636 x 10-6	3.013 x 10-6	0.7246
-100	2.038	966	0.01582	8.036 x 106	1.189 x10-5	5.837 x 10-6	0.7263
-50	1.582	999	0.01979	1.252 x105	1.474 x10-5	9.319 x 10-6	0.7440
-40	1.514	1002	0.02057	1.356 x105	1.527 x10-5	1.008 x10-5	0.7436
-30	1.451	1004	0.02134	1.465 x105	1.579 x10-5	1.087 x10-5	0.7425
-20	1.394	1005	0.02211	1.578 x105	1.630 x10-5	1.169 x10-5	0.7408
-10	1.341	1006	0.02288	1.696 x105	1.680 x10-5	1.252 x10-5	0.7387
0	1.292	1006	0.02364	1.818 x105	1.729 x10-5	1.338 x10-5	0.7362
5	1.269	1006	0.02401	1.880 x105	1.754 x10-5	1.382 x10-5	0.7350
10	1.246	1006	0.02439	1.944 x105	1.778 x10-5	1.426 x10-5	0.7336
15	1.225	1007	0.02476	2.009 x105	1.802 x10-5	1.470 x10-5	0.7323
20	1.204	1007	0.02514	2.074 x105	1.825 x10-5	1.516 x10-5	0.7309
25	1.184	1007	0.02551	2.141 x105	1.849 x10- 5	1.562 x10-5	0.7296
30	1.164	1007	0.02588	2.208 x105	1.872 x10-5	1.608 x10-5	0.7282
35	1.145	1007	0.02625	2.277 x105	1.895 x10-5	1.655 x10-5	0.7268
40	1.127	1007	0.02662	2.346 x105	1.918 x10-5	1.702 x10-5	0.7255
45	1.109	1007	0.02699	2.416 x105	1.941 x10-5	1.750 x10-5	0.7241
50	1.092	1007	0.02735	2.487 x105	1.963 x10-5	1.798 x10-5	0.7228
60	1.059	1007	0.02808	2.632 x105	2.008 x10-5	1.896 x10-5	0.7202
70	1.028	1007	0.02881	2.780 x105	2.052 x10-5	1.995 x10-5	0.7177
80	0.9994	1008	0.02953	2.931 x105	2.096 x10-5	2.097 x10-5	0.7154
90	0.9718	1008	0.03024	3.086 x105	2.139 x10-5	2.201 x10-5	0.7132
100	0.9458	1009	0.03095	3.243 x105	2.181 x10-5	2.306 x10-5	0.7111
120	0.8977	1011	0.03235	3.565 x105	2.264 x10-5	2.522 x10-5	0.7073
140	0.8542	1013	0.03374	3.898 x105	2.345 x10-5	2.745 x10-5	0.7041
160	0.8148	1016	0.03511	4.241 x105	2.420 x10-5	2.975 x10-5	0.7014
180	0.7788	1019	0.03646	4.593 x105	2.504 x10-5	3.212 x10-5	0.6992
200	0.7459	1023	0.03779	4.954 x105	2.577 x10-5	3.455 x10-5	0.6974
250	0.6746	1033	0.04104	5.890 x105	2.760 x10-5	4.091 x10-5	0.6946
300	0.6158	1044	0.04418	6.871 x105	2.934 x10-5	4.765 x10-5	0.6935
350	0.5664	1056	0.04721	7.892 x105	3.101 x10-5	5.475 x10-5	0.6937
400	0.5243	1069	0.05015	8.951 x105	3.261 x10-5	6.219 x10-5	0.6948
450	0.4880	1081	0.05298	1.004 x 104	3.415 x10-5	6.997 x10-5	0.6965
500	0.4565	1093	0.05572	1.117 x 104	3.563 x10-5	7.806 x10-5	0.6986
600	0.4042	1115	0.06093	1.352 x 104	3.846 x10-5	9.515 x10-5	0.7037
700	0.3627	1135	0.06581	1.598 x 104	4.111 x10-5	1.133 x 10-4	0.7092
800	0.3289	1153	0.07037	1.855 x 104	4.362 x10-5	1.326 x 10-4	0.7149
900	0.3008	1169	0.07465	2.122 x 104	4.600 x10-5	1.529 x 10-4	0.7206
1000	0.2772	1184	0.07868	2.398 x 104	4.826 x10-5	1.741 x 10-4	0.7260
1500	0.1990	1234	0.09599	3.908 x 104	5.817 x10-5	2.922 x 10-4	0.7478
2000	0.1553	1264	0.11113	5.664 x 104	6.630 x10-5	4.270 x 10-4	0.7539

Note: For ideal gases, the properties c_ρ, k, µ, and Pr are independent of pressure. The properties ρ, ν, and α at a pressure P (in atm) other than 1 atm are determined by multiplying the values of ρ at the given temperature by P and by dividing v and α by P.

Source: Data generated from the EES software developed by S. A. Klein and F. L. Alvarado. Original sources: Keenan, Chao, Keyes, Gas Tables, Wiley, 1984; and Thermophysical Properties of Matter. Vol. 3: Thermal Conductivity, Y. S. Touloukian, P. E. Liley, S. C. Saxena, Vol. 11: Viscosity, Y. S. Touloukian, S. C. Saxena, and P. Hestermans, IFI/Plenun, NY, 1970, ISBN 0-306067020-8.